FWIW, I have been physically moving USB connections between the plotter and farmer. I have the farmer NFS mount the plotters drives during plotting so that I don’t lose a proof opportunity while an entire drive is being plotted. When the drive is full I unmount it from the farmer, then the plotter, then I move it and re-mount it on the farmer.
For various reasons I had a few drives on the farmer that weren’t quite full. But with my 16 port USB hub, drives don’t attach in the same sequence each time. So I was going to have to go through a bunch of efforts to identify which physical drives were the ones I needed to move over to the plotter to fill up.
For giggles I decided to make the destination drive on MadMax be an NFS drive on the farmer (mounting in the opposite direction). My plotting time went from 3,000 seconds to 3,170 seconds. The final step of copying to destination was obviously much longer, but I didn’t really care as it wasn’t any longer than what it would take me copy the file after I was done plotting (I got 86 MB/s ave via MadMax final copy step)
Plotter → NFS over Gb Network → Farmer → USB 3.0 Drive
I basically was willing to take the 5% plotting time hit to avoid the hassle of having to move it afterwards.